What sort of kink?
For down flat downs, I find that with an urban takeoff, it helps to start on the closest part of your foot when you land on the rail, and move to the furthest away.
I generally slide right foot forward, so that means coming in from the right side of the rail, I land on my toes. At the first kink, I move to the center of my boot, and at the last a little towards the heel. This helps absorb the kinks. For a lipslide, it goes in reverse. Heel, center, then toe.
If the takeoff is not an urban set up, come in square with it.
I also find that it helps to stay loose, and keep plenty of pressure on that forward foot.
Good luck.